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with arcpy.da.UpdateCursor(path_noeud, ["Id_node", "Coordx", "Coordy", "Coordx_m", "Coordy_m", "SHAPE@X", "SHAPE@Y"]) as ucursor:
    n = 0  
    for row1 in ucursor:
        x_move, y_move = False, False
        if row1[3] != 0 and row1[4] != 0:
            if row1[1] != row1[3]:
                row1[5] = row1[3]
                x_move = True
            if row1[2] != row1[4]:
                row1[6] = row1[4]
                y_move = True
            if x_move or y_move:
                n += 1                    
        ucursor.updateRow(row1)


dict_noeud = {}
with arcpy.da.SearchCursor(path_noeud, ["Id_node", "Coordx_m", "Coordy_m", "SHAPE@X", "SHAPE@Y"], spatial_reference=pt_sr) as scursor:
    for row in scursor:
        Id_node = row[0]
        ptX = row[3]
        ptY = row[4]
        dict_noeud = str(int(Id_node)), str(ptX), str(ptY)


with arcpy.da.UpdateCursor(path_arc, ["SHAPE@", "F_id_node", "T_id_node", "Id_arc"]) as curs:
    for row in curs:
        shape = row[0]
        F_id_node = row[1]
        T_id_node = row[2]
        for key in dict_noeud:
            if F_id_node in dict_noeud:
                arcpy.AddMessage("hi")
                shape.firstPoint.X = dict_noeud[(ptX)]
                shape.firstPoint.Y = dict_noeud[(ptY)]
            elif T_id_node in dict_noeud:
                shape.lastPoint.X = dict_noeud[(ptX)]
                shape.lastPoint.Y = dict_noeud[(ptY)]
                arcpy.AddMessage("ho")
        curs.updateRow(row)


arcpy.RefreshActiveView()